D-Galactose catabolism in archaea: Operation of the DeLey-Doudoroff pathway in Haloferax volcanii.
D-Galactose catabolism in archaea: Operation of the DeLey-Doudoroff pathway in Haloferax volcanii.
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古细菌中的 D-半乳糖分解代谢:Haloferax volcanii 中 DeLey-Doudoroff 通路的运作
DOI:
10.1093/femsle/fnaa029
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发表时间:
2020
影响因子:
2.1
通讯作者:
Schönheit P.
中科院分区:
文献类型:
--
作者:
Tästensen JB;Johnsen U;Reinhardt A;Ortjohann M;Schönheit P.
The haloarchaeonHaloferax volcaniiwas found to grow on D-galactose as carbon and energy source. Here we report a comprehensive analysis of D-galactose catabolism inH. volcanii. Genome analyses indicated a cluster of genes encoding putative enzymes of the DeLey–Doudoroff pathway for D-galactose degradation including galactose dehydrogenase, galactonate dehydratase, 2-keto-3-deoxygalactonate kinase and 2-keto-3-deoxy-6-phosphogalactonate (KDPGal) aldolase. The recombinant galactose dehydrogenase and galactonate dehydratase showed high specificity for D-galactose and galactonate, respectively, whereas KDPGal aldolase was promiscuous in utilizing KDPGal and also the C4 epimer 2-keto-3-deoxy-6-phosphogluconate as substrates. Growth studies with knock-out mutants indicated the functional involvement of galactose dehydrogenase, galactonate dehydratase and KDPGal aldolase in D-galactose degradation. Further, the transcriptional regulator GacR was identified, which was characterized as an activator of genes of the DeLey–Doudoroff pathway. Finally, genes were identified encoding components of an ABC transporter and a knock-out mutant of the substrate binding protein indicated the functional involvement of this transporter in D-galactose uptake. This is the first report of D-galactose degradation via the DeLey–Doudoroff pathway in the domain of archaea.
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影响因子:
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通讯作者:
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2.9
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通讯作者:
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